CN102257738B - Uplink multi-cell signal processing for interference suppression - Google Patents
Uplink multi-cell signal processing for interference suppression Download PDFInfo
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Abstract
A node (e.g., base station, signal processing unit) is described herein that includes a symbol detector and a method which are capable of suppressing interference caused by one user device (which may be in softer handoff mode) to reduce performance degradation to other intra-cell user devices and/or other inter-cell user devices (which may not be in softer handoff mode).
Description
Technical field
In general, the present invention relates to field of wireless telecommunications, specifically, relate to comprise symbol detector node (for example, base station or signal processing unit) and method, this node and method for suppressing from the interference of a user's set to reduce the performance degradation of user's set in other community and/or other inter-cell user device.
Background technology
With reference to figure 1(prior art), for example to comprise node 102(, base station 102, signal processing unit 102) the parent map of wireless communication system 100, wherein node 102 has and is coupled at least one reception antenna 106 that covers the first sector 108 and the receiver 104 that covers at least one reception antenna 110 of the second sector 112. Reception antenna 106 and 110 is co-located on identical base station towers or website conventionally, but along different direction orientations.But in the case, reception antenna 106 and 110 is parts of distributing antenna system, and is not co-located in together after this manner, process for Centroid 102 but receive respectively composite received signal 107 and 111.In this example, three user's set 114a, the 114b and the 114c that are arranged in the first sector 108 are shown, and a user's set 114d is arranged in the second sector 112.Nowadays, when border 116 places of first user device 114a between the first and second sectors 108 and 112 or near time, it may cause interference to the similar community user device such as user's set 114b and 114c, in addition also may cause interference to other community user device such as user's set 114d.For example, in Wideband Code Division Multiple Access (WCDMA) (WCDMA) wireless communication system 100, nowadays have the up link of enhancing for example to allow user's set 114a() transmit up to 11 Mbps.High rate user device 114a may cause in community and disturb user's set 114b and 114c, and user's set 114d is caused to presence of intercell interference.In fact,, in the time that high rate user device 114a is positioned at sector borders 116 place, presence of intercell interference can be quite remarkable.Node of the present invention (it comprises symbol detector) and method have solved this interference problem and other problem.
Summary of the invention
In one aspect, the invention provides a kind of being for example suitable for, by (thering is node that symbol detector suppresses the interference between user's set, base station, signal processing unit), wherein symbol detector comprises: (a) receiver, and it is coupled at least one reception antenna that covers the first sector and at least one reception antenna that covers the second sector; And (b) signal processor, its for: (I) processed by covering at least one reception antenna of the first sector and covering the composite received signal that at least one reception antenna of the second sector receives, and wherein composite received signal comprises the first user signal transmitting from first user device and the second subscriber signal transmitting from the second user's set; (II) determines whether first user signal causes interference to any one in the first sector and the second sector or the second subscriber signal receiving in both; And (III) is if first user signal causes interference to the second subscriber signal really, recovers the second subscriber signal so by processing composite signal to form sign estimation.This node suppresses effectively by the interference may near the first user device border between two sectors causing, to reduce the degradation of the second user's set receiving uplink signal of the arbitrary sector from being arranged in two sectors.
In yet another aspect, the invention provides a kind of method for suppressing to disturb, the method comprises the following steps: (a) process the composite received signal receiving by covering at least one reception antenna of the first sector and at least one reception antenna of covering the second sector, wherein composite received signal comprises the first user signal transmitting from first user device and the second subscriber signal transmitting from the second user's set; (b) determine whether first user signal causes interference to any one in the first sector and the second sector or the second subscriber signal receiving in both; And if (c) first user signal causes interference to the second subscriber signal really, recover the second subscriber signal by processing composite signal to form sign estimation so.The method suppresses effectively by the interference may near the first user device border between two sectors causing, to reduce the degradation of the second user's set receiving uplink signal of the arbitrary sector from being arranged in two sectors.
Additional aspect of the present invention will partly be set forth in embodiment, accompanying drawing and any claim of enclosing, and partly will draw from embodiment, or can understand by putting into practice the present invention.To understand, above general description and just exemplary and illustrative of following detailed description, instead of limit disclosed invention.
Brief description of the drawings
While detailed description in detail, can obtain more complete understanding of the invention below reading by reference to the accompanying drawings, in accompanying drawing:
Fig. 1 (prior art) is the parent map for helping the legacy wireless communication system that the interference problem solving by the present invention is described;
Fig. 2 be according to one embodiment of the invention have comprise symbol detector node (for example, base station, signal processing unit) the parent map of wireless communication system, wherein symbol detector suppresses the interference being caused by an interference user device to reduce from the degradation of user's set in other community and/or other inter-cell user device receiving uplink signal;
Fig. 3 A-3B for example illustrates, according to the one embodiment of the invention figure of two different instances configurations of node (, base station, signal processing unit) shown in figure 2; And
Fig. 4-7th, illustrates in greater detail according to the one embodiment of the invention figure of the basic module of symbol detector shown in figure 2.
Embodiment
In the following detailed description, the unrestriced object for explanation, sets forth a kind of exemplary node (for example, base station, signal processing unit), is arranged on specifically exemplary symbol detector wherein, so that complete understanding the present invention.But those skilled in the art will understand after the present invention having benefited from, can put into practice the present invention in other embodiment that does not depart from detail disclosed herein.In addition, omitted the description to well known device, method and material, in order to avoid make description of the invention hard to understand.Finally, where applicable, herein element like similar Reference numeral representation class.
With reference to figure 2, be according to one embodiment of the invention have comprise symbol detector 204 node 202(for example, base station 202, signal processing unit 202) the parent map of wireless communication system 200, wherein symbol detector 204 suppresses the interference being caused by a user's set 216a in order to avoid affects user's set 216b and 216c and/or other inter-cell user device 216d in other community.Symbol detector 204 has at least one reception antenna 208 that is coupled to covering the first sector 210 and the receiver 206 that covers at least one reception antenna 212 of the second sector 214.In this example, three user's set 216a, 216b and 216c are arranged in the first sector 210, and a user's set 216b is arranged in the second sector 214.Separately there are border 218 places of user's set 216a between the first and second sectors 210 and 214.Symbol detector 204 also comprises one or more signal processor 220(, and it can be the part of receiver 206), the one or more processor 220 is suitable for: (a) process the composite received signal 224a and the 224b that are received by reception antenna 208 and 212 respectively, one or more subscriber signal 226b, 226c and 226d(step 1) that wherein composite received signal 224a and 224b include the subscriber signal 226a that transmits from user's set 216a and transmit from one or more user's set 216b, 216c and 216d respectively; (b) determine that whether subscriber signal 226a causes interference (step 2) at least one subscriber signal in any one in the first sector 210 and the second sector 214 or subscriber signal 226b, the 226c and the 226d that receive in both; And (c) if recover this at least one subscriber signal 226b, the 226c being disturbed and 226d(step 3) by processing the composite received signal 224a and the 224b that are received by reception antenna 208 and 212 to form sign estimation so.
In an example, processing composite signal 224a and 224b can be by utilizing softer merging (softer combining) technology to complete to form sign estimation, and the interference that softer folding suppresses to be caused by (being associated with user's set 216a) subscriber signal 226a is effectively in order to avoid impact (being associated with user's set 216b, 216c in community and/or inter-cell user device 216d) subscriber signal 226b, 226c and/or 226d.In this example, first user device 216a is conventionally in soft or More Soft Handoff (handoff) pattern operation, because its sector borders 218 place between the first and second sectors 210 and 214.In the up link of CDMA, " soft handover " represent to process independently by fan antenna 208 gather the composite signal 224a of (pick up) and the composite signal 224b that gathered by antenna 212 to form independent system estimation, and composite signal 224a and 224b are jointly processed in " More Soft Handoff " expression, and in most of the cases after despreading, it is merged to form sign estimation jointly.In this example, suppose that first user device 216a transmission meeting in the time of this position causes the uplink signal 226a of interference to being arranged in other user's set 216b, the 216c of the first and second sectors 210 and 214 and 216d.Other user's set 216b, 216c and 216d can be positioned at the position away from sector borders 218, and conventionally do not operate in More Soft Handoff pattern after this manner.But, to have benefited from significantly according to the use of symbol detector 204 of the present invention from subscriber signal 226b, 226c and the 226d of these user's sets 216b, 216c and 216d reception, the antenna of the symbol detector 204 different sectors of leap covering (for example, antenna 208 and 212) realize softer folding, as chip equalization or G-Rake(broad sense Rake).As below will at length discussed, G-Rake utilizes high data rate to disturb time and the spatial correlation characteristic of first user signal 226a to suppress the interference to other subscriber signal 226b, 226c and 226d substantially.In the following discussion, term " G-Rake4 " is for representing softer Merge Scenarios, and it utilizes G-Rake to merge and weigh and merges the signal receiving from four reception antennas.Or, also can use chip equalization, wherein before despreading, merge baseband sample or base band value.And other More Soft Handoff folding is also possible, comprise the nonlinear method such as decision feedback equalization (DFE), maximum-likelihood sequence estimation (MLSE) and turbo equilibrium.
If node 202(for example, base station 202) receiver 206 that receives signal at least two reception antenna 212a at least two reception antenna 208a from the first sector 210 and 208b and 214 places, the second sector and 212b is equipped with, can enable so G-Rake4.Shown in Fig. 3 A, there is an example of such base station 202 of multiple sectors 210 and 214, wherein the first sector 210 has two reception antenna 208a and 208b(ant1 and ant2), and the second sector 214 has two reception antenna 212a and 212b(ant1 and ant2).Another example shown in Fig. 3 B, wherein base station 202 is connected to reception antenna 208a, 208b, 212a and 212b, two reception antenna 208a that are wherein associated from the first sector 210 and 208b(ant1 and ant2) be deployed in two reception antenna 212a that are associated with the second sector 214 and 212b(ant1 and ant2) different position or websites.Popular turning to when one disposes below " master-long-range concept " or " optical fiber is to antenna concept " or " distributing antenna system ".To be positioned at same position or diverse location irrelevant with these antenna 208a, 208b, 212a and 212b, and all these antenna 208a, 208b, 212a and 212b are coupled in base station 202 of the present invention.
Therefore, according to one embodiment of present invention, when base station 202 detects while existing from the strong interference signal 226a of the user's set 216a in More Soft Handoff, their corresponding subscriber signal 226b, 226c and the 226d that base station 202 receives by user's set 216b, 216c and 216d and in the sector 210 and 214 being associated is so placed in softer merging patterns, and utilizes G-Rake to merge power to merge the despread values that antenna 208a, 208b, 212a and 212b from being associated with sector 210 and 214 collect.Traditionally, while only receiving consumingly their signal in sector 210 and 214, just user's set 216b, 216c and 216d are placed in to More Soft Handoff.But, in the present invention, utilize second reason that user's set 216b, 216c and 216d are placed in to More Soft Handoff.Below about Fig. 4-7, discussion is incorporated into base station 202 herein in detail, how is-symbol detector 204 can realize this example specifically.But, before discussing exemplary symbol detector 204, should understand, the present invention extends to and exceedes More Soft Handoff.Therefore, in this arranges, the concept of base station 202 represent in fact to process from one or several sector 210 and 214(community 210 and 214) node of signal of the antenna 208 and 212 that is associated.And the present invention can utilize in multiple interference user devices (multiple user's set 214a) and multiple community user's set and/or multiple inter-cell user device to realize.
With reference to figure 4-7, be to illustrate in greater detail the figure of the basic module of exemplary symbol detector 204 according to an embodiment of the invention.As shown in Figure 4, symbol detector 204 has the G-Rake receiver 206 that is coupled to multiple reception antenna 208a, 208b, 212a and 212b, and these reception antennas 208a, 208b, 212a and 212b receive respectively and form composite signal 224a and 224b(and see again Fig. 3 A-3B) signal 402a, 402b, 402c and 402d.In an example, each reception signal 402a and 402b(composite signal 224a) and each reception signal 402c and 402d(composite signal 224b) comprising: by user's set 216a(for example, by high data rate user device 216a) the reception copy of first user signal 226a that transmits, by user's set 216b, 216c and 216d(are for example, by voice user's device 216b, 216c and 216d) transmit the second subscriber signal 226b, the reception duplicate of 226c and 226d, and comprise the signal from other user, other signal 502(of Noise and Interference is shown in Fig. 5).G-Rake receiver 206 also has for by corresponding signal 402a, 402b, 402c and 402d(, they form composite signal 224a and 224b) be converted to multiple mixing/filtering/ sampling unit 404a, 404b, 404c and the 404d of baseband sample 406a, 406b, 406c and 406d.G-Rake receiver 206 utilize despreader unit 408a, 408b, 408c and 408d and the sequence spreading that is associated be concerned about symbol by respective antenna baseband sample 406a, 406b, 406c and 406d despreading (noting: each despreader unit 408a, 408b, 408c or 408d can be made up of multiple fingers (finger), and each finger postpones corresponding to specific finger).Utilize merge power set w produce sign estimation 414(rectification symbol 414) G-Rake merge cells 412 in merge these multiple despread values 410a, 410b, 410c and 410d.As shown in the figure, G-Rake merge cells 412 receives merging power w from merging power calculator 416.Merge power calculator 416 and merge power w by utilizing clean response h and damage (impairment) covariance R to calculate.In this example, only responding h is provided by the channel estimator 418 of processing baseband sample 406a, 406b, 406c and 406d.Impairment covariance R is provided by the impairment covariance matrix estimator 420 of processing baseband sample 406a, 406b, 406c and 406d.
G-Rake receiver 206 merges time and the spatial coherence that power w disturbs with explanation (account for) and by user's set 216a(for example suppresses by being formulated as follows) interference of the symbol be concerned about of the impact that causes:
Wherein w merges power, and h is clean response, and R is impairment covariance.White noise causes unit damage covariance matrix R conventionally.Under these circumstances, merge power and be reduced to w=h, and therefore G-Rake becomes Rake, this is best in white noise.But, for example, interference in code division multiple access (CDMA) () is likely coloured, because signal 226a, 226b, 226c or 226d advance through frequency selectivity (non-white) passage, that is, frequency selectivity passage makes received signal 226a, 226b, 226c or 226d band color.In the time of grass color, receiving Existential Space/temporal correlation between signal 226a, 226b, 226c or 226d and noise so, and in the time that design merges power w to suppresses bad noise, according to the present invention, this correlation can be used for disturbing and suppresses.Next will describe about a kind of detailed discussion of method that can realize this.
G-Rake receiver 206 can be carried out and disturbs inhibition by being formulated space/temporal correlation of antenna 208a, 208b, 208c and 208d that impairment covariance matrix R is associated with multiple sectors 210 and 214 with the leap that causes due to main interference source of explanation.For example, the contribution R that impairment covariance matrix R can cause due to self-interference by following explanation
s with the contribution R disturbing from other user
i contribution:
R=R
S +R
I
Wherein, in this example, R
s to be associated with one of user terminal 216b, 216c or 216d, and R
i to be associated with user terminal 216a.By comprise R in R
i , G-Rake can suppress the interference being caused by the signal 226a of user terminal 216a.In one embodiment, impairment covariance matrix R can utilize the illegal code method described in the U.S. number of patent application 12/135268 of jointly amortizing of submitting on June 9th, 2008 to estimate, this patent application is entitled as " Method and Apparatus for Estimating Impairment Covariance Matrices using Unoccupied Spreading Codes " (content of the literature is incorporated into herein hereby by reference).
With reference to figure 6, be to illustrate in greater detail the figure of the assembly of exemplary impairment covariance matrix estimator 420 according to an embodiment of the invention.As shown in the figure, impairment covariance matrix estimator 420 has illegal code despreader unit 602a, 602b, 602c and 602d, and it receives respectively base band aerial signal 406a, 406b, 406c and 406d and exports illegal code despread values vector
,
,
with
.All illegal code despread vector are collected in vector cascade unit 604
,
,
with
, and output
.Outer Product of Vectors averaging unit 606 receives vector
, and press as follows to vector
apposition be averaging:
Note common tags
the base band aerial signal that can be used for j the reception antenna based on from sector i is identified k the illegal code despread values vector (each finger postpones an element) during symbol period.
G-Rake receiver 206 also has the channel estimator 418 of estimating clean response h for each subscriber signal.Merging power calculator 416 uses the clean response h and the impairment covariance matrix R that estimate to see equation to be formulated merging weight vector w(
and Fig. 4).According to the example of Fig. 2, from user's set 226d(for example) the subscriber signal 216d that transmits can be deployed in two antenna 208a and 208b the first sector 210 and two the antenna 212a and the 212b(that are deployed in the second sector 214 are shown in Fig. 3 A-3B) gather.Then, each aerial signal 404a, 404b, 404c and 404d will be through down-conversion, filtering and samplings, to produce base band aerial signal 406a, 406b, 406c and 406d.Then, channel estimator 418 utilizes each base band aerial signal 406a, 406b, 406c and 406d for example, to respond for be concerned about signal (, subscriber signal 226d) produces only
estimate.Next discuss exemplary channel estimator 418 about Fig. 7.
With reference to figure 7, be to illustrate in greater detail the figure of the basic module of channel estimator 418 according to an embodiment of the invention.As shown in the figure, channel estimator 418 has multiple channel estimator 702a, 702b, 702c and 702d, and they receive respectively base band aerial signal 406a, 406b, 406c and 406d, and the clean response of output estimation
,
,
with
.The clean response of estimating is collected in vector cascade unit 704
,
,
with
, and output
, wherein subscript T represents vectorial transposition.In one embodiment, corresponding to the clean response of each antenna 208a, 208b, 212a and 212b
,
,
with
can be by by antenna reception sample and relevant acquisition of spreading code for frequency pilot sign.Note common tags
for identifying the clean response (each finger postpones an element) of the estimation being associated with j the reception antenna of particular sector i.206 of G-Rake receivers described herein are as an example, because it can process multiple sectors (community) aerial signal to determine sign estimation 414.Or, can adopt other signal processor 220 or treatment technology to process multiple sectors (community) aerial signal to determine sign estimation 414 according to the present invention.
As discussed above, if user's set 216a(is for example) in More Soft Handoff pattern, can suppose that so it is transmitting other user's set 216b, 216c to being arranged in the first and second sectors 210 and 214 and 216d and cause the uplink signal 226a of interference.The actual detection compared with high reject signal from the user's set 226a(in More Soft Handoff pattern for example) can be carried out by several different methods.For example, utilize centralized approach, the symbol detector 204 of the each signal in More Soft Handoff can measure signal intensity or Noise Background rise, and this amount is established to threshold value.Or, also can establish threshold value to the data rate signaling in up link.Then, the existence of the strong signal in More Soft Handoff is sent signals to node 202, then node 202 adopts and disturbs the softer merging of inhibition to detect the symbol being transmitted by user's set 216b, 216c and 216d.Or signal in the sector 210 and 214 that can take to strong signal, so that symbol detector 204 knows in interference suppresses to process to comprise which the fan antenna signal being associated with other subscriber signal.
Also can use distributed blind method.In this case, symbol detector 204 is estimated from the damage correlation between antenna 208a, 208b, 212a and the 212b of all sectors 210 and 214.Then,, in the time (via thresholding) being detected from the larger correlation between the antenna of different sectors (, spatial coherence), comprise those aerial signals to further process according to the present invention.For example, can determine the amplitude peak correlation to the aerial signal postponing in specific phase.Given normalized value between 0 and 1, can be by the square root divided by corresponding diagonal entry by this correlation normalization.For fear of square root, can use magnitude squared value.Therefore, antenna 1 is postponed 0 and antenna 2 postpone amplitude square phase cross correlation between 0 divided by antenna 1 postpone 0 with itself and antenna 2 postpone 0 with the correlation of itself.
In another method, even if for example work as interference user device 216a(, high data rate user device 216a) not in the time of More Soft Handoff pattern, if base station 202 determines that antenna 208a, the 208b, 212a and the 212b that are associated with multiple sectors 210 and 214 are with good signal strength signal intensity collection high data rate user signal 226a, this can merge other user's set 226b, 226c by these sectors 210 and 214 services and the softer interference of 226d triggering up link so.
An advantage of the invention is, it can easily realize in existing base station, because the most of existing base station nowadays using has been equipped with two reception antennas that cover a sector (community).Therefore, when user's set 216a(for example) during in More Soft Handoff, its signal by with two sectors 210 and 214(community 210 and 214) four reception antenna 208a, the 208b, 212a and the 212b that are associated receive.This to other user's set 216b, 216c and 216d(for example makes it possible to according to the present invention as mentioned above) carry out G-Rake4 and receive.Should understand, the mark of More Soft Handoff also extends to many sectors (many communities) signal processing.This be because, whether tube antenna is not positioned at same website, according to the present invention, all can be at symbol detector 204 multiple aerial signals that the multiple sectors of reason (community) receives everywhere, to recover the symbol that transmits.
Another advantage of the present invention is, symbol detector 204 has the ability that suppresses main interference source, wherein the multiple sectors 210 and 214 that have the signal of high power level relatively and arrive base station 202 of main interference source.Proposed scheme also has advantages of the serial interference elimination of being better than (SIC) scheme, as described below:
1, the optimum performance of SIC by after decoding eliminate realize, wherein receiver is decoded interference signal, regeneration it, then by it from receive signal eliminate.This process has been introduced multi-slot delay for low-rate users.By contrast, this symbol detector 204 has the low-down stand-by period, this means that can on the basis of time slot one by one, be formulated G-Rake4 merges power w.
2, the present invention is based on the extension of softer rule of merger and acquisition and G-Rake Unite principle, and SIC needs main architecture revision.Therefore,, if realize SIC completely in existing and following base station, the present invention can be used as middle solution so.
3, the present invention also can be combined with SIC, and wherein the present invention can suppress the SIC coloured interference of any residue afterwards.
Another advantage of the present invention is, node 202 has downlink operation that can decoupling zero from the softer union operation of up link.Therefore, user's set 216d(is for example) can be in softer merging patterns in up link, and in down link not in soft handover.This means, the set of small active area can be for this particular user device 216d(for example) remain unchanged, and extra fan antenna 208a and 208b(are for example) can be considered it is that the degree of freedom increasing suppresses to strengthen to disturb.Additional, the sector 210(newly relating to is for example) it can be defined as to " small active area ".
Although shown in the drawings and described multiple embodiment of the present invention in above detailed description in detail, but should be appreciated that, the invention is not restricted to the disclosed embodiments, but in the case of do not depart from as mentioned above and as the spirit of the present invention of the claim definition of enclosing, can also have numerously rearrange, revise and replace.
Claims (20)
1. be suitable for suppressing a node for the interference between user's set, described node comprises:
Symbol detector, it comprises:
Receiver, it is coupled at least one reception antenna that covers the first sector and at least one reception antenna that covers the second sector; And
Signal processor, its for:
Process the composite received signal receiving by covering described at least one reception antenna of described the first sector and described at least one reception antenna of described the second sector of covering, described composite received signal includes the first user signal transmitting from first user device and the second subscriber signal transmitting from the second user's set;
Determine whether described first user signal causes interference to any one in described the first sector and described the second sector or described the second subscriber signal receiving in both; And
If described first user signal causes interference to described the second subscriber signal really, recover described the second subscriber signal by processing described composite signal to form sign estimation so.
2. node as claimed in claim 1, wherein covers described at least one reception antenna of described the first sector and described at least one reception antenna of described the second sector of covering is deployed in same site.
3. node as claimed in claim 1, wherein covers described at least one reception antenna of described the first sector and described at least one reception antenna of described the second sector of covering is deployed in different websites.
4. node as claimed in claim 1, wherein said signal processor is also processed described composite signal by the following method to form described sign estimation and to recover described the second subscriber signal: process the described reception signal being associated with described at least one antenna of described the first sector of covering and described at least one antenna of described the second sector of covering to form one of base band value and despread values; And utilize the set that merges power to merge income value.
5. node as claimed in claim 4, the explanation of wherein said merging power is covering described at least one reception antenna of described the first sector and is covering the damage correlation occurring between described at least one reception antenna of described the second sector.
6. node as claimed in claim 1, wherein said signal processor is also by utilizing More Soft Handoff folding to process described composite signal to form described sign estimation and to recover described the second subscriber signal.
7. node as claimed in claim 1, if wherein described first user device is in soft or More Soft Handoff pattern, so described signal processor determines that described first user signal causes interference to described the second subscriber signal.
8. node as claimed in claim 1, the described first user signal that wherein if the transmission of described first user device has threshold parameter and received by described at least one reception antenna of described the first sector of covering and described at least one reception antenna of described the second sector of covering, so described signal processor determines that described first user signal causes interference to described the second subscriber signal.
9. node as claimed in claim 1, if wherein the instruction of damage correlation exists threshold value correlation between described at least one reception antenna of described the first sector of covering and described at least one reception antenna of described the second sector of covering, so described signal processor determines that described first user signal causes interference to described the second subscriber signal.
10. node as claimed in claim 1, wherein said signal processor is by making described the second user's set for ul transmissions in More Soft Handoff pattern but do not make described the second user's set recover described the second subscriber signal in described More Soft Handoff pattern for downlink transmission.
11. 1 kinds of methods for suppressing to disturb, said method comprising the steps of:
Process the composite received signal receiving by covering at least one reception antenna of the first sector and at least one reception antenna of covering the second sector, described composite received signal includes the first user signal transmitting from first user device and the second subscriber signal transmitting from the second user's set;
Determine whether described first user signal causes interference to any one in described the first sector and described the second sector or described the second subscriber signal receiving in both; And
If described first user signal causes interference to described the second subscriber signal really, recover described the second subscriber signal by processing described composite signal to form sign estimation so.
12. methods as claimed in claim 11, wherein cover described at least one reception antenna of described the first sector and described at least one reception antenna of described the second sector of covering is deployed in same site.
13. methods as claimed in claim 11, wherein cover described at least one reception antenna of described the first sector and described at least one reception antenna of described the second sector of covering is deployed in diverse location.
14. methods as claimed in claim 11, wherein process described composite signal to form described sign estimation, and the described recovery of described the second subscriber signal also comprises: process the described reception signal being associated with described at least one antenna of described the first sector of covering and described at least one antenna of described the second sector of covering to form one of base band value and despread values; And utilize the set that merges power to merge income value.
15. methods as claimed in claim 14, the explanation of wherein said merging power is covering described at least one reception antenna of described the first sector and is covering the damage correlation occurring between described at least one reception antenna of described the second sector.
16. methods as claimed in claim 11, wherein said recovering step also comprises the softer interference folding of utilization.
17. methods as claimed in claim 11, wherein said determining step also comprises: if described first user device in soft handoff mode, determines that described first user signal causes interference to described the second subscriber signal so.
18. methods as claimed in claim 11, wherein said determining step also comprises: if the transmission of described first user device has threshold parameter and by the described first user signal that covers described at least one reception antenna of described the first sector and described at least one reception antenna reception of described the second sector of covering, determines that so described first user signal causes interference to described the second subscriber signal.
19. methods as claimed in claim 11, wherein said determining step also comprise determine damage correlation whether indicate cover described the first sector described at least one reception antenna with covering described the second sector described at least one reception antenna between there is threshold value correlation.
20. methods as claimed in claim 11, wherein said recovering step also comprises: make described the second user's set in More Soft Handoff pattern for ul transmissions, but do not make described the second user's set in described More Soft Handoff pattern for downlink transmission.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/339,967 | 2008-12-19 | ||
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| PCT/IB2009/007768 WO2010070419A2 (en) | 2008-12-19 | 2009-12-15 | Uplink multi-cell signal processing for interference suppression |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2010070419A3 (en) | 2010-09-30 |
| CN102257738A (en) | 2011-11-23 |
| US20100159838A1 (en) | 2010-06-24 |
| WO2010070419A2 (en) | 2010-06-24 |
| US8000655B2 (en) | 2011-08-16 |
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